Web threading device for rotary printing machines



June 7, 1932. 1,861,609

WEB THREADING DEVICE FOR ROTARY PRINTING MACHINES c. GIQUICK ET AL Filed Jan. 6, 1930 3 Sheets-Sheet ENVENTQRS.

dag/2W June 7, 1932. c QUlCK ET AL 1,861,609

WEB THREADING DEVICE FOR ROTARY PRINTING MACHINES Filed Jan. 6, 1930 3 Sheets-Sheet 2 v FIG.2..

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June 7, 1932- c. G. QUICK ET AL WEB THREADING DEVICE FOR ROTARY PRINTING MACHINES Filed Jan. 6, 1950 5 Sheets-Sheet 5 Patented June 7, 1932 HILLS, LONDON, ENGLAND, CORPORATION OF NEW YORK WEB TEBEADING DEVICE FOR Application filed January 6, 1930, Serial No.

This invention relates to web threading devices for machines.

Her'etofore, in rotary printing machines, the web from a roll has usually been threaded between the impression and type cylinders, either by hand or by means of leading-in improvements in rotary printlng tapes, which pass between the impression and type cylinders, and are frictionally driven thereby. The web is temporarily attached by pinning, for example, to the tapes; and after the web has been led through, the machine is sto ped to allow the web to be disconnected fl om the tapes, and the press is then re-started.

With this arrangement, the leading-in tapes continue to be driven after the web has been disconnected therefrom.

hile such an arrangement is comparatively satisfactory when the machine is driven at the speed which, until recently, has been customarv. there is increasing speed at which printing machines are driven, a serious risk of the leading-in tapes breaking, or coming off the cylinders or rollers or pulleys, and causing delay and possibly serious damage to the machine.

The object of the present invention is to provide means by which this risk is obviated.

According to the present invention the leading-in tapes, instead of passing between the impression and type cylinders, pass over pulleys which can be driven by the machine to lead the web, (when temporarily connected to the tapes) between the impression and type cylinders. The pulleys can then be disconnected so that the tapes cease to be driven.

The invention is illustrated in the accompanying drawings, "in which Figures -1 and 2 are general views showing the invention applied to a printing machine, Figure 1 being a side elevation, and Figure 2 a part plan. Figures 3, 4 and 5 are detail views to a larger scale; Figures 3 and 4 being sectional elevations at right angles to one another, and Figure 5 a sectional elevat-ion.

Referring more particularly to Figures 1 and 2, 12 are respectivelyimpression and type cylinders, and 3 indicates the inking mechanism therefor.

now, owing to the 17 ROTARY PRINTING MACHINES 418,898, and in Great Britain July 11, 1929 4 indicates a tape which passes in a closed loop around pulleys 5, 6 and 7, located at one side of the machine. The pulleys 5 are of the same diameter as that of the impression cylinders and are coaxial therewith. The pulleys are located at one end of the rollers around which the web to be threaded is turned.

Either or both of constructed as shown in Figures 3 and 4. As shown in these figures, the pulley is rotatably mounted on the shaft 8 of the impression cylinder, and is provided with a clutch mechanism. The clutch comprises pins 9, carried in the boss 10 of a handwheel 11, mounted on the boss 12 of the pulley 5, the said pins being adapted to extend into apertures 13 formed in a ring 14 secured to the shaft 8. The handwheel 11 is located in its in and out positions by aball 15 pressed y a spring 16 to enter positioning recesses in the boss 12. a The pulleys 6 are constructed as shownin Figure 5, in order to provide a convenient mounting for the end of the rollers, (one of which is indicated at 18) over which the web runs. The pulley 6 is bored out to pass over a bearing block 19 which may be mounted either on an arm 20, indicated in Figure 1, or directly on the side frame of the machine. The pulley is prevented from endwise movement on the block 19 by screws'21 which extend into a circumferential groove 22 formed in the said block. The block is counter-bored to house a ball bearing 23, which supports one end of the roller 18, the other end of which is supported in the usual manner.

In operation, the web, (indicated by dotted lines where it follows a path diflerent from that of the tape) is temporarily attached, as by pinning, to the tape 4 at a point adjacent the lowermost pulley 6. The handwheel 11 is then slid along the boss 12 until the pins 9 extend into the apertures 13 in the ring 14. The press is then inched round, the drive being transmitted through the clutch to the pulleys 5 and hence to the tapes. After the web has been thus drawn by the tape between the first printing couple and then between the second couple, the press is stopped, the web the pulleys 5 is, or are means to unpinned from the tape, and the handwheel 11 slid to disconnect the clutch. Thus, when the press is started up, the tapes remain stationary, and in high speed presses the danger of damage due to the tapes breaking or of coming off the cylinders is obviated.

The tapes may obviously be employed to lead the web to any other point, such as to the folder.

When the leading-in tapes are arranged according to the present invention, it is possible to so arrange the return run of the tapes as to be clear of the gangways and without crossovers.

What we claim is:

1. In a web threading device for a rotary printing machine, a tape to which the web may be secured, pulleys to guide the tape through the machine and a driving connection whereby one of the pulleys may be connected to a rotating element of the machine; said connection being disconnectible to prevent driving the tape 'during normal operation of the machine.

2. In a web threading device for a rotary printing machine, a tape to which the web may be secured, pulleys to guide the tape through the machine, means to drive one of the pulleys in synchronism with oral speed of the printing cylinders, and

disconnect said driving means.

3. In a web threading device for a rotary printing machine, a tape to which the web may be secured, guide pulleys for the tape and means to drive one of the pulleys including a clutch whereby it may be temporarily connected to a suitable rotatable element of the machine.

4. In a web threading device for a rotary printing machine having an impression cylinder with a shaft, a tape to which the web may be secured. pulleys to guide the tape through the machine, one of said pulleys be ing located at one end of and coaxial with the impression cylinder, and a clutch mechanism adapted to connect the pulley to the cylinder shaft.

5. In a web threading device for a rotary printing machine having an impression cylinder secured to a shaft, a tape to which the web may be secured, pulleys to guide the tape through the machine, and a clutch mechanism whereby one of the pulleys may be operatably connected to the shaft.

6. In combination with a rotary press machine having an impression cylinder secured to a shaft, a web threading device including a tape to which the web may be attached, a pulley loose on the shaft and adapted to guide the tape, and a clutch mechanism whereby the pulley may be operatably connected to the shaft.

7. In a web threading device for a rotary printing machine having a pair of printing cylinders, a tape to which the web may be secured, pulleys to guide the taFe throiilgh the machine, means to drive one o the pu eye at a peripheral speed corresponding to that of the printing cylinders, and means to disconnect said driving means; the path of the said tape being arranged parallel with and adjacent to one edge of the web.

' In testimony whereof we afix our signatures.

CECIL GEORGE QUICK. RALPH WILLIAM CHILES.

the periph- I 

